Presonus Eris E3.5, Active Studio Monitors, 3.5"" Woofer with Kevlar cone, 1"" Tweeter with silk cone, Frequency range: 80 - 20,000 Hz, Sound pressure level: 100 dBA SPL (peak), Inputs: TRS jacks (L/R symmetrical), RCA pair (L/R), Treble control, Bass control (-6 to +6dB each), Front-side AUX input (stereo mini jack) for smartphone etc., Front-side headphone jack (stereo mini jack), Front-side volume control with on/off switch and status LED, Class AB power amplifier (2x 25 W sine), Shielded against HF interference, Switch-on delay and output current limiter, Overheating protection and subsonic filter, Includes mini jack cable (TRS to TRS), 1.5 m, adapter cable (mini jack TRS to 2 x RCA), 1.5 m and connecting cable from left speaker to right speaker, Dimensions (H x W x D): 210 x 141 x 162 mm, Weight: 2.9 kg